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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Most of these soltuons were written long before ES6 was viable to use day-to-day.
Should use arrow function
Just want to say that Math.pow() is no longer considered best practice. Just use the exponentiation operator in ES6. So it would be (c ** 2).
In the java tests, the expected and actual values on failure are reversed.
Having public fields isn't seen as good practice in Java. It would be better with private fields, and getters to access the values